Introduction
This user manual provides detailed instructions for the operation and maintenance of your HCMOBI Bone Conduction Headphones (Model S100). Please read this manual thoroughly before using the product to ensure proper function and longevity.

Image: HCMOBI Bone Conduction Headphones, featuring a black body with a green band, designed for open-ear wear.
Setup
What's in the Box
- 1 x HCMOBI Bone Conduction Headphones (Model S100)
- 1 x Type-C Charge Cable
- 1 x User Manual

Image: The product packaging displaying the headphones, a Type-C charging cable, and the user manual.
Charging the Headphones
Before first use, fully charge the headphones. Connect the provided Type-C charging cable to the charging port on the headphones and the other end to a compatible USB power source. The red LED indicator will be on during charging. Once fully charged, the LED indicator will turn blue.
A full charge takes approximately 1.5 hours and provides up to 10 hours of music playtime. A 10-minute fast charge can provide 1 hour of use.
Pairing with a Device
To pair your headphones with a Bluetooth-enabled device:
- Ensure the headphones are powered off.
- Press and hold the On/Off button for 3 seconds until the blue and red lights flash alternately, indicating pairing mode.
- On your device (smartphone, tablet, PC), open "Settings" and navigate to "Bluetooth".
- Select "S100" from the list of available devices to connect. Once connected, the blue light will stop flashing.
Video: This video demonstrates the power-on, Bluetooth pairing, music playback controls (play/pause, volume up/down, next/previous song), voice assistant activation, and Type-C charging process for the HCMOBI Bone Conduction Headphones.
Operation
Controls and Functions
The headphones feature intuitive controls for easy management of your audio and calls.
- Power On/Off: Press and hold the Power button for 3 seconds.
- Play/Pause Music: Click the On/Off button once.
- Volume Up: Click the "+" button to increase volume by 10%.
- Volume Down: Click the "-" button to decrease volume by 10%.
- Next Song: Long press the "+" button.
- Previous Song: Long press the "-" button.
- Activate Voice Assistant (Siri/Google Assistant): Double click the Power button.
- Answer/End Call: Click the Power button once.
- Reject Call: Long press the Power button.

Image: A detailed diagram illustrating the location and function of each button on the headphone's control panel, including LED indicator, volume controls, power button, and Type-C charging port.
Key Features
- Comfortable & Stable Fit: Ergonomically designed with soft silicone material, lightweight (26g), and a flexible titanium headband for secure wear during various activities.
- Open Ear Design & Superior Sound Quality: Utilizes vibration-free bone conduction technology, allowing awareness of surroundings. Engineered for clear highs, soft mids, and deep bass.
- 10-Hour Battery & Fast Charge: Built-in 230 mAh battery provides 10 hours of playtime. USB-C fast charging allows 1 hour of use from a 10-minute charge.
- Bluetooth 5.2 & IP65 Waterproof: Offers faster data transmission and stable signal up to 33ft. IP65 rating protects against sweat, rain, and oil, suitable for sports and outdoor use.

Image: Demonstrates the comfortable and stable fit of the open-ear headphones compared to traditional in-ear headphones, highlighting the pain-free design.

Image: Highlights the lightweight (0.9oz/26g), elastic headband, and IPX4 waterproof features, emphasizing the headphones' suitability for sports activities.

Image: Illustrates the high-fidelity audio, noise-canceling microphone, and exclusive vocalizer features, showcasing the superior sound quality for music and calls.

Image: Compares Bluetooth 5.2 features of the headphones with older versions, highlighting faster speed, lower delay, and compatibility with various devices like smartwatches, iPhones, Android phones, and tablets.

Image: Details the 10-hour battery life, 230mAh battery capacity, and 1.5-hour quick charging feature, emphasizing long-lasting use and efficient charging.
Maintenance
Cleaning
Regular cleaning helps maintain the performance and hygiene of your headphones. Use a soft, damp cloth to wipe down the surfaces. Avoid using harsh chemicals or abrasive materials. Given the IP65 waterproof rating, the headphones can withstand sweat and light rain, but should not be submerged in water.
Storage
Store the headphones in a cool, dry place away from direct sunlight and extreme temperatures. When not in use for extended periods, ensure they are fully charged before storage to preserve battery health.
Troubleshooting
If you encounter issues with your HCMOBI Bone Conduction Headphones, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Headphones do not power on. | Low battery. | Charge the headphones fully. |
| Cannot pair with device. | Headphones not in pairing mode; Bluetooth off on device; device too far. | Ensure headphones are in pairing mode (flashing red/blue). Turn on Bluetooth on your device. Move headphones closer to the device (within 33ft). |
| No sound or low sound. | Volume too low; not connected; incorrect audio output selected on device. | Increase headphone and device volume. Re-pair the headphones. Check device's audio output settings. |
| Headphones automatically turn off when charging. | This is normal behavior for the device. | Headphones are designed to turn off during charging. Power them on after disconnecting from charger. |
| Volume resets to 100% after re-pairing. | Device specific behavior. | Adjust volume manually after each re-pairing. |
Specifications
| Feature | Detail |
|---|---|
| Brand | HCMOBI |
| Model Name | S100 |
| Connectivity Technology | Bluetooth 5.2, Wireless |
| Wireless Communication Technology | Bluetooth |
| Headphones Jack | USB (Type-C) |
| Battery Life | 10 Hours |
| Charging Time | 1.5 Hours |
| Battery Capacity | 230 mAh |
| Water Resistance Level | IP65 Waterproof |
| Item Weight | 3.2 ounces (approx. 90g) |
| Material | Plastic |
| Ear Placement | Open Ear |
| Control Type | Media Control |
| Control Method | Touch (buttons) |
| Frequency Range | 20 Hz - 20,000 Hz |
| Bluetooth Range | 10 Meters (33 feet) |
| Manufacturer | CelsusSound |
| UPC | 711523306424 |
Warranty and Support
HCMOBI offers a 90-day money-back guarantee and a one-year warranty for these bone conduction headphones.
If you encounter any problems or have questions regarding your product, please contact our professional customer service team. We are committed to replying and solving your problem within 6 hours.
For support, please refer to the contact information provided on the product packaging or the official HCMOBI website.





